PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Tornadoes may sometimes occur after warning signs such as the darkening of the sky, hail, loud roaring sounds, debris being swept up, funnel-shaped clouds, fast moving clouds, and the formation of wall clouds.
http://www.w3.org/ns/prov#wasQuotedFrom
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